Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b3fa90ed1d552b…

MALICIOUS

PDF

88.7 KB Created: 2021-08-04 06:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 487aa2937aca739ebd6d95f653992165 SHA-1: 62d117a1613c52a93f848815cf6e5a8becad4948 SHA-256: 88b3fa90ed1d552b0a37afddce84332a02c99ebb971517508c837c32cab04d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised websites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ovistar-dz.com/ckfinder/userfiles/files/zedalesilemivipofuwil.pdf In PDF document text
    • https://regionalhealthprogramsww.com/images/file/lopokonizogamanopugipigok.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/78263845256.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/35180356616.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090c303d475a---40351929884.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/8683712239.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/sovadapusobunajani.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hlp7v5uh3m606vmht5kdgajrhb/kejemaviwola.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160715ac85f29a---xeradatuwobe.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2256448f---bitigosolodikixil.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/tiwifozenowelitutadu.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/fadafebirulunetomuvafed.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/95529127211.pdfIn PDF document text
    • https://ewt.cz/res/file/nitojemegebegi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94333a2d22---lovezufowo.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/74459206522.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/odjs30kgoce1i5hoophmrl6in1/82654410497.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/redegumarudevope.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210614_48A45E0FA423E7B8.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/ludofolegu.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/12342429237.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8d5e632c1---67082734917.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607640aa2204d---senigowutonugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gta+vice+city+stories+cso+ppsspp+android+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 16688 bytes
SHA-256: c30a5306bb27193514b30d916787d8bd29f95b74cada5a7e94360568ed7fcb64
font_01_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB7 10812 bytes
SHA-256: 8a5fba09b14ca1d1afa5dcd19fdb26728c49fc937585f6026b66a09a3141c8d2

Open this report in the interactive analyzer, or submit your own file for analysis.